Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf50aee79a91e618…

MALICIOUS

PDF

139.1 KB Created: 2021-06-29 13:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59e89ed1a0a3bf317c4578d23893a3b SHA-1: a70dc8c7ca0682915fd4ca9a09327deda2214135 SHA-256: cf50aee79a91e618b38a6e4d5e15fd27c2c403b83bbd195d5edc72c5fdd1c955
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=do+squirrels+eat+leaves
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebd42534e---88312554333.pdf
    • http://happinessgown.com/upload/users/files/kexolotolotozukitubilubew.pdf
    • http://ghioroiu.ro/sites/default/files/file/kozuzumokelekoso.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5bc36c47---fugut.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/xeluxikukuxipujiwoxabodo.pdf
    • https://matrainagycsalados.hu/userfiles/file/23720188865.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5cffdccff978120e280011ba61c393af/70748984390.pdf
    • https://cncostruzioni.com/userfiles/file/10437443642.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8ee694c097cb8a362964ff294a837abb/52929194126.pdf
    • http://kawanmto.info/contents//files/64341410534.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/698d70e73ba9988e6ff7c1a2572f268c/48026399730.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ibekboqcg1c15bof2dnljk829r/37934331954.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/uv2k0tob2ihj0013l7s7ldc262/gejotigol.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093db4f2e054---79621883311.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cc01e82dc17f2e7d255ffc2e5a6b8c73/bitetimepizalixebabuwikon.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ili0lpltbsavoq8tgfgghhor5d/61464518621.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/99f137c925c3253f65e8bfbf2b253b09/kuwazusum.pdf
    • https://kristinanamaste.eu/files/zapopovipuvomejononidit.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q4nckcs8k50ndhsp3usrbgam91/64204628398.pdf
    • http://novichiha.ru/pic/file/95934561446.pdf
    • https://jamuiboe.com/webroot/upload_media/jaxojurakobubenapiv.pdf
    • http://changju-hotel.com/CKEdit/upload/files/31958793220.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2c4.bin
7521b2cd5447b17b53c964510b6a957e9b17ad28fe9221a8b92d33a5b864f821
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2C4 10312 bytes
font_01_sfnt_off0001da2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA2D 16792 bytes
font_02_sfnt_off0001f23f.bin
846bc5d43808b25515e41f68a03a7af10862b148142a5c8c28c8e3472958d4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F23F 17096 bytes